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d84c7b0582
This adds support for lowering sibling calls with outgoing arguments. e.g ``` define void @foo(i32 %a) ``` Support is ported from AArch64ISelLowering's `isEligibleForTailCallOptimization`. The only thing that is missing is a full port of `TargetLowering::parametersInCSRMatch`. So, if we're using swiftself, we'll never tail call. - Rename `analyzeCallResult` to `analyzeArgInfo`, since the function is now used for both outgoing and incoming arguments - Teach `OutgoingArgHandler` about tail calls. Tail calls use frame indices for stack arguments. - Teach `lowerFormalArguments` to set the bytes in the caller's stack argument area. This is used later to check if the tail call's parameters will fit on the caller's stack. - Add `areCalleeOutgoingArgsTailCallable` to perform the eligibility check on the callee's outgoing arguments. For testing: - Update call-translator-tail-call to verify that we can now tail call with outgoing arguments, use G_FRAME_INDEX for stack arguments, and respect the size of the caller's stack - Remove GISel-specific check lines from speculation-hardening.ll, since GISel now tail calls like the other selectors - Add a GISel test line to tailcall-string-rvo.ll since we can tail call in that test now - Add a GISel test line to tailcall_misched_graph.ll since we tail call there now. Add specific check lines for GISel, since the debug output from the machine-scheduler differs with GlobalISel. The dependency still holds, but the output comes out in a different order. Differential Revision: https://reviews.llvm.org/D67471 llvm-svn: 371780
102 lines
2.6 KiB
LLVM
102 lines
2.6 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-apple-ios7.0 | FileCheck %s
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; RUN: llc -global-isel < %s -mtriple=arm64-apple-ios7.0 | FileCheck %s
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@t = weak global i32 ()* null
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@x = external global i32, align 4
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define void @t2() {
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; CHECK-LABEL: t2:
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; CHECK: adrp x[[GOTADDR:[0-9]+]], _t@GOTPAGE
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; CHECK: ldr x[[ADDR:[0-9]+]], [x[[GOTADDR]], _t@GOTPAGEOFF]
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; CHECK: ldr x[[DEST:[0-9]+]], [x[[ADDR]]]
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; CHECK: br x[[DEST]]
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%tmp = load i32 ()*, i32 ()** @t
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%tmp.upgrd.2 = tail call i32 %tmp()
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ret void
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}
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define void @t3() {
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; CHECK-LABEL: t3:
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; CHECK: b _t2
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tail call void @t2()
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ret void
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}
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define double @t4(double %a) nounwind readonly ssp {
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; CHECK-LABEL: t4:
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; CHECK: b _sin
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%tmp = tail call double @sin(double %a) nounwind readonly
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ret double %tmp
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}
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define float @t5(float %a) nounwind readonly ssp {
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; CHECK-LABEL: t5:
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; CHECK: b _sinf
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%tmp = tail call float @sinf(float %a) nounwind readonly
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ret float %tmp
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}
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define void @t7() nounwind {
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; CHECK-LABEL: t7:
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; CHECK: b _foo
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; CHECK: b _bar
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br i1 undef, label %bb, label %bb1.lr.ph
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bb1.lr.ph: ; preds = %entry
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tail call void @bar() nounwind
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ret void
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bb: ; preds = %entry
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tail call void @foo() nounwind
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ret void
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}
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define i32 @t8(i32 %x) nounwind ssp {
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; CHECK-LABEL: t8:
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; CHECK: b _c
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; CHECK: b _a
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; CHECK: b _b
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%and = and i32 %x, 1
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%tobool = icmp eq i32 %and, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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%call = tail call i32 @a(i32 %x) nounwind
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br label %return
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if.end: ; preds = %entry
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%and1 = and i32 %x, 2
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%tobool2 = icmp eq i32 %and1, 0
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br i1 %tobool2, label %if.end5, label %if.then3
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if.then3: ; preds = %if.end
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%call4 = tail call i32 @b(i32 %x) nounwind
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br label %return
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if.end5: ; preds = %if.end
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%call6 = tail call i32 @c(i32 %x) nounwind
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br label %return
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return: ; preds = %if.end5, %if.then3, %if.then
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%retval.0 = phi i32 [ %call, %if.then ], [ %call4, %if.then3 ], [ %call6, %if.end5 ]
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ret i32 %retval.0
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}
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declare float @sinf(float) nounwind readonly
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declare double @sin(double) nounwind readonly
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declare void @bar() nounwind
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declare void @foo() nounwind
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declare i32 @a(i32)
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declare i32 @b(i32)
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declare i32 @c(i32)
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; CHECK-LABEL: tswift:
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; CHECK: b _swiftfunc
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define swiftcc i32 @tswift(i32 %a) nounwind {
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%res = tail call i32 @swiftfunc(i32 %a)
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ret i32 %res
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}
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declare swiftcc i32 @swiftfunc(i32) nounwind
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